I had read around on reputable websites such as lifehacker.com and stevepavlina.com of a mysterious caffeine and nap combination.
I just tried it out in hopes of increasing productivity. It works amazingly well. I am very awake and alert, but not jittery from the caffeine. If you're looking to cram in a few more hours of studying or looking to make your awake time more efficient, I heartily recommend the caffeine slingshot.
How To: